Danny Phantom: The Ultimate Enemy

Released in 2006 for the Game Boy Advance, and based on the Nickelodeon series of the same name, Danny Phantom: The Ultimate Enemy follows the events of the episode "The Ultimate Enemy". In the future, Danny Phantom becomes evil and terrorizes the whole world. To prevent this, Clockwork, a ghost responsible for watching over time, tries to alter Danny's life in the past by sending ghosts from the future after him. This eventually leads to Danny facing the possibility of his future and putting a stop to it himself, facing off against his evil future self and saving his family.

This game is pretty short normally, but doubles in size when attempting to go for 100%. I complete the main story to get the first password to unlock the difficulty select. Then a playthrough in "Hard" mode, then the Burger King mini games and boss rush, and finally completing mission mode for the true ending and the final password. For context, this game was released alongside a Burger King promotional. Back in 2006, you would need to collect all the kid's meal Danny Phantom toys which contained passwords for this game. This would unlock the mini games.